What is complaining it can't find a device? Even when the LG TV was
stuck in Google Home, it never complained to me unless I tried to
interact with that device in some way; otherwise it was just sitting
there, taunting me.
I ended up removing it via my Google Assistant's settings.From inside
the Google Home app, click/press on your account icon in the top-right
and go to Assistant Settings. Scroll down and go to Devices; find the
offending LG TV in that list and delete...